SPIN-DENSITY-WAVE CLUSTERS IN PDMN SPIN-GLASS ALLOYS

PdMn disordered alloys with concentrations above 5 at. % Mn display ch aracteristic properties of spin glasses. We report here neutron-diffra ction data for Pd90Mn10 and Pd80Mn20 single crystals. Satellite diffus e peaks were observed for both specimens at the (1 +/- delta 0 0) posi tions (delta = 0.37 for Pd90Mn10 and delta = 0.16 for Pd80Mn20) accomp anied with the atomic-short-range-order peak at (1 0 0). These satelli tes disappear at temperatures far above the freezing temperature T-F. The origin of the spin-glass-like behavior in PdMn alloys can be ascri bed to the dynamics of the fluctuating spin-density-wave clusters just as observed in CuMn alloys. Various properties observed here are comp ared with those of CuMn alloys. [S0163-1829(97)03342-0].